The use of liquid chromatography for the analysis of metal ions in aqueous solutions and for the determination of water in organic matrices
The value of a p-phenylenediammonium eluent in single-column ion chromatography is demonstrated. It is shown to be particularly useful for separating trivalent aluminum from common divalent metal ion interferences. The aluminum is detected with a conductivity detector. Postcolumn reaction in liquid chromatography is reviewed. The application of disodium 1-(2-thiazolylazo)-2-naphthol-3,6-disulfonate (TAN-3,6-S) to the detection of metal ions in single-column ion chromatography with a visible absorbance detector is explored. TAN-3,6-S is shown to complex a large number of metal ions. It is particularly useful postcolumn reagent because by the judicious selection of effluent pH, selectivity may be introduced into the detection system. Temperature is shown to affect the retention times of divalent and trivalent metal ions in ion chromatography. Factors contributing to this phenomenon are examined, and enthalpy changes for several ion-exchange reactions are calculated and compared. Two methods for the determination of water in organic matrices using liquid chromatography and a spectrophotometric detector are presented. Both employ a chromatographic separation by ion-exclusion. The first detection method makes use of solvatochromism, the shift in an organic spectrum which occurs as solvent polarity is changed. This second detection method uses a solid-phase postcolumn reactor containing a cation-exchange resin in the H{sup +} form. This reactor acts as catalyst for a reaction occurring between water and two components of the mobile phase, methanol and trans-cinnamaldehyde.
- Research Organization:
- Iowa State Univ. of Science and Technology, Ames, IA (USA)
- DOE Contract Number:
- W-7405-ENG-82
- OSTI ID:
- 7121697
- Resource Relation:
- Other Information: Thesis (Ph. D.)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
CATIONS
QUANTITATIVE CHEMICAL ANALYSIS
INORGANIC COMPOUNDS
ORGANIC COMPOUNDS
ION EXCHANGE CHROMATOGRAPHY
WATER
AQUEOUS SOLUTIONS
CHEMICAL ANALYSIS
SPECTROSCOPY
CHARGED PARTICLES
CHROMATOGRAPHY
DISPERSIONS
HYDROGEN COMPOUNDS
IONS
MIXTURES
OXYGEN COMPOUNDS
SEPARATION PROCESSES
SOLUTIONS
400100* - Analytical & Separations Chemistry